Even with Codex, DOA6 v1.20 has a notorious bug/feature: In the official game, you earn "Pattern Points." In the Codex version, because the "Online Pattern Share" server is dead, you are stuck with whatever patterns the crack emulates—usually less than 20% of the costumes.
Koei Tecmo later released a minor patch (1.21) that only adjusted store links. Update 1.20 is considered the final content-complete version, with all characters, stages, and balance fixes before support ended. The Corepack repack preserves this exact state, free from launcher updates. dead or alive 6 update 120 codex corepack